PLC Tutorials - Instrumentation Tools

Interconnection between PLC, MCC, LCP & Pumps – Video

This video shows us the relation between Programmable Logic Controller (PLC), motor control center (MCC), Local Control Panel (LCP) for controlling a Pump or Motor.

Electrical Switches Principle & Types

Electrical Switches have mechanical contacts or relays. Types of electrical switches are SPST, SPDT, DPST, DPDT and other custom designs.

How to Troubleshoot a PLC System?

This guide shows the step-by-step tactic for troubleshooting a PLC during a system malfunction or when a problem occurs in running a PLC.

How to Reduce Relay Noise in PLC Systems?

Today we are going to discuss about Relay Noise reduction method for a PLC system. we observe more noise is generating by relay output switching.

PLC Output Types

PLC outputs are of two types: 1. Relay. 2. Solid state. Relay outputs are mechanical contacts and Solid State outputs are like transistor, TRIAC.

PLC Analog I/O Potential Problems – Troubleshooting & Issues

This section covers the PLC Analog I/O Potential Problems and PLC troubleshooting tips for the basic programmable logic controller (PLC).

PLC Ladder Logic Example

PLC ladder Logic Example to understand relay control circuits into a virtual form where contacts and coils interact to perform control functions.

Control Room and Field Instruments Questions and Answers

Instrument Engineers Interview Questions, Control Room Interview Questions, Field Instruments Questions and Answers, Instrumentation Questions & Answers.

PLC Sinking and Sourcing Explanation

PLC Sinking and Sourcing describes a current signal flow relationship between field input and output devices in a control system and their power supply.

Sink or source PNP or NPN Normally Open or Normally Closed Input v. output. output

Sink or Source? Normally Open or Normally Closed?

We discuss concepts of Sink or Source used in electrical circuits or in PLC wiring. Also we deal with basics of normally open contact or normally closed contact.